Two silent objects moving slowly. Daylight sighting.While eating a snack outside the Safeway store in the University District of Seattle, I saw two objects in the morning sky. They both had three white lights mounted to them at what would have been the rear of them, given the direction they were moving. They were headed from NE to SW silently. I pointed them out to someone in the parking lot and he didn't know what they were, either. It's difficult to judge the altitude of the crafts; they weren't flying particularly low but they also weren't way up in the sky either. I would guess 2,000-3,000 ft up. I watched them until one of them disappeared.